diff --git a/src/zend/_type.rs b/src/zend/_type.rs
index dc2ba47830..4342e3fcf4 100644
--- a/src/zend/_type.rs
+++ b/src/zend/_type.rs
@@ -1,4 +1,7 @@
-use std::{ffi::c_void, ptr};
+use std::{
+    ffi::{c_void, CString},
+    ptr,
+};
 
 use crate::{
     ffi::{
@@ -6,7 +9,6 @@ use crate::{
         _ZEND_SEND_MODE_SHIFT, _ZEND_TYPE_NAME_BIT, _ZEND_TYPE_NULLABLE_BIT,
     },
     flags::DataType,
-    types::ZendStr,
 };
 
 /// Internal Zend type.
@@ -80,7 +82,7 @@ impl ZendType {
         allow_null: bool,
     ) -> Option<Self> {
         Some(Self {
-            ptr: ZendStr::new(class_name, true).into_raw().as_ptr() as *mut c_void,
+            ptr: CString::new(class_name).ok()?.into_raw() as *mut c_void,
             type_mask: _ZEND_TYPE_NAME_BIT
                 | (if allow_null {
                     _ZEND_TYPE_NULLABLE_BIT